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Early Plant Retirements Early Plant Retirements (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
Early Plant Retirements [Line Items] |  |  |  |
Total Assets |  | $ 40,524 | $ 40,524 | $ 40,070
Asset Retirement Obligations |  | 744 | 744 | 726
Power [Member] |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |
Total Assets |  | 11,619 | 11,619 | 12,193
Asset Retirement Obligations |  | 526 | 526 | 511
Power [Member] | Energy Costs [Member] |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |
Coal Inventory Lower of Cost or Market Adjustments |  | 2 | 9 | 62
Power [Member] | Operating Expense [Member] |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |
Operation and Maintenance charges |  | 4 | 4 | 53
Power [Member] | Depreciation And Amortization [Domain] |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |
Accelerated Depreciation including Asset Retirement Costs |  | 390 | 964 | $ 571
Hope Creek [Member] | Nuclear Plant [Member] |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |
Materials and Supplies Inventory |  | 83 | 83 |
Nuclear Production, net of Accumulated Depreciation |  | 453 | 453 |
Nuclear Fuel In-Service, net of Accumulated Depreciation |  | 136 | 136 |
Construction Work in Progress (including nuclear fuel) |  | 168 | 168 |
Total Assets |  | 840 | 840 |
Asset Retirement Obligations |  | 146 | 146 |
Total Liabilities |  | 146 | 146 |
Net Assets |  | $ 694 | $ 694 |
% Owned |  | 100.00% | 100.00% |
Salem [Member] | Nuclear Plant [Member] |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |
Materials and Supplies Inventory |  | $ 80 | $ 80 |
Nuclear Production, net of Accumulated Depreciation |  | 561 | 561 |
Nuclear Fuel In-Service, net of Accumulated Depreciation |  | 113 | 113 |
Construction Work in Progress (including nuclear fuel) |  | 109 | 109 |
Total Assets |  | 863 | 863 |
Asset Retirement Obligations |  | 159 | 159 |
Total Liabilities |  | 159 | 159 |
Net Assets |  | $ 704 | $ 704 |
% Owned |  | 57.00% | 57.00% |
Nuclear Support Facilities [Member] | Nuclear Plant [Member] |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |
Materials and Supplies Inventory | [1] | $ 0 | $ 0 |
Nuclear Production, net of Accumulated Depreciation | [1] | 208 | 208 |
Nuclear Fuel In-Service, net of Accumulated Depreciation | [1] | 0 | 0 |
Construction Work in Progress (including nuclear fuel) | [1] | 9 | 9 |
Total Assets | [1] | 217 | 217 |
Asset Retirement Obligations | [1] | 0 | 0 |
Total Liabilities | [1] | 0 | 0 |
Net Assets | [1] | $ 217 | $ 217 |
% Owned | [1] | 0.00% | 0.00% |
Peach Bottom [Member] | Nuclear Plant [Member] |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |
Materials and Supplies Inventory |  | $ 41 | $ 41 |
Nuclear Production, net of Accumulated Depreciation |  | 758 | 758 |
Nuclear Fuel In-Service, net of Accumulated Depreciation |  | 125 | 125 |
Construction Work in Progress (including nuclear fuel) |  | 31 | 31 |
Total Assets |  | 955 | 955 |
Asset Retirement Obligations |  | 162 | 162 |
Total Liabilities |  | 162 | 162 |
Net Assets |  | $ 793 | $ 793 |
% Owned |  | 50.00% | 50.00% |
[1] | Includes Hope Creek’s and Salem’s shared support facilities and other nuclear development capital.

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